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CVE-2026-31675

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In netem_enqueue(), the packet corruption logic uses get_ra…

Published Apr 25, 2026CWE-125EPSS 0.18%

Overview

CVE-2026-31675 is a high-severity vulnerability. It was published on April 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/sched: sch_netem: fix out-of-bounds access in packet corruption

In netem_enqueue(), the packet corruption logic uses

get_random_u32_below(skb_headlen(skb)) to select an index for

modifying skb->data. When an AF_PACKET TX_RING sends fully non-linear

packets over an IPIP tunnel, skb_headlen(skb) evaluates to 0.

Passing 0 to get_random_u32_below() takes the variable-ceil slow path

which returns an unconstrained 32-bit random integer. Using this

unconstrained value as an offset into skb->data results in an

out-of-bounds memory access.

Fix this by verifying skb_headlen(skb) is non-zero before attempting

to corrupt the linear data area. Fully non-linear packets will silently

bypass the corruption logic.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46fRefgit.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12Refgit.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258adRefgit.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908Refgit.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31675?

CVE-2026-31675 is a high-severity vulnerability. It was published on April 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31675?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31675?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31675?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31675 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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